[1] Univ Vermont, Robert Larner MD Coll Med, Burlington, VT USA
[2] Univ Texas Southwestern Med Ctr, Dept Pediat, Dallas, TX USA
[3] Univ Vermont, Curriculum Team Off Med Educ, Robert Larner MD Coll Med, Burlington, VT USA
[4] Univ Vermont, Dept Med, Robert Larner MD Coll Med, Burlington, VT USA
[5] Univ Vermont, Div Adult Cardiol, Childrens Hosp, Burlington, VT USA
[6] Univ Vermont, Biostat Res Core, Robert Larner MD Coll Med, Burlington, VT USA
[7] Univ Vermont, Dept Pediat, Robert Larner MD Coll Med, Burlington, VT USA
[8] Univ Vermont, Div Pediat Cardiol, Childrens Hosp, Burlington, VT USA
[9] Univ Vermont, Childrens Hosp, Dept Pediat, 111 Colchester Ave,Patrick 581, Burlington, VT 05401 USA